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# This file is part of Autoconf. -- Autoconf -- # Type related macros: existence, sizeof, and structure members. # # Copyright (C) 2000-2002, 2004-2012 Free Software Foundation, Inc. # This file is part of Autoconf. This program is free # software; you can redistribute it and/or modify it under the # terms of the GNU General Public License as published by the # Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # Under Section 7 of GPL version 3, you are granted additional # permissions described in the Autoconf Configure Script Exception, # version 3.0, as published by the Free Software Foundation. # # You should have received a copy of the GNU General Public License # and a copy of the Autoconf Configure Script Exception along with # this program; see the files COPYINGv3 and COPYING.EXCEPTION # respectively. If not, see <http://www.gnu.org/licenses/>. # Written by David MacKenzie, with help from # Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor, # Roland McGrath, Noah Friedman, david d zuhn, and many others. ## ---------------- ## ## Type existence. ## ## ---------------- ## # ---------------- # # General checks. # # ---------------- # # Up to 2.13 included, Autoconf used to provide the macro # # AC_CHECK_TYPE(TYPE, DEFAULT) # # Since, it provides another version which fits better with the other # AC_CHECK_ families: # # AC_CHECK_TYPE(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # # In order to provide backward compatibility, the new scheme is # implemented as _AC_CHECK_TYPE_NEW, the old scheme as _AC_CHECK_TYPE_OLD, # and AC_CHECK_TYPE branches to one or the other, depending upon its # arguments. # _AC_CHECK_TYPE_NEW_BODY # ----------------------- # Shell function body for _AC_CHECK_TYPE_NEW. This macro implements the # former task of AC_CHECK_TYPE, with one big difference though: AC_CHECK_TYPE # used to grep in the headers, which, BTW, led to many problems until the # extended regular expression was correct and did not give false positives. # It turned out there are even portability issues with egrep... # # The most obvious way to check for a TYPE is just to compile a variable # definition: # # TYPE my_var; # # (TYPE being the second parameter to the shell function, hence $[]2 in m4). # Unfortunately this does not work for const qualified types in C++, where # you need an initializer. So you think of # # TYPE my_var = (TYPE) 0; # # Unfortunately, again, this is not valid for some C++ classes. # # Then you look for another scheme. For instance you think of declaring # a function which uses a parameter of type TYPE: # # int foo (TYPE param); # # but of course you soon realize this does not make it with K&R # compilers. And by no means do you want to use this: # # int foo (param) # TYPE param # { ; } # # since C++ would complain loudly. # # Don't even think of using a function return type, since K&R cries # there too. So you start thinking of declaring a pointer to this TYPE: # # TYPE p; # # but you know fairly well that this is legal in C for aggregates which # are unknown (TYPE = struct does-not-exist). # # Then you think of using sizeof to make sure the TYPE is really # defined: # # sizeof (TYPE); # # That is great, but has one drawback: it succeeds when TYPE happens # to be a variable: you'd get the size of the variable's type. # Obviously, we must not accept a variable in place of a type name. # # So, to filter out the last possibility, we will require that this fail: # # sizeof ((TYPE)); # # This evokes a syntax error when TYPE is a type, but succeeds if TYPE # is actually a variable. # # Also note that we use # # if (sizeof (TYPE)) # # to `read' sizeof (to avoid warnings), while not depending on its type # (not necessarily size_t etc.). # # C++ disallows defining types inside `sizeof ()', but that's OK, # since we don't want to consider unnamed structs to be types for C++, # precisely because they don't work in cases like that. m4_define([_AC_CHECK_TYPE_NEW_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for $[]2], [$[]3], [AS_VAR_SET([$[]3], [no]) AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([$[]4], [if (sizeof ($[]2)) return 0;])], [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([$[]4], [if (sizeof (($[]2))) return 0;])], [], [AS_VAR_SET([$[]3], [yes])])])]) AS_LINENO_POP ])dnl # _AC_CHECK_TYPE_NEW(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # ------------------------------------------------------------ # Check whether the type TYPE is supported by the system, maybe via the # the provided includes. AC_DEFUN([_AC_CHECK_TYPE_NEW], [AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_type], [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_type], [LINENO TYPE VAR INCLUDES], [Tests whether TYPE exists after having included INCLUDES, setting cache variable VAR accordingly.])], [$0_BODY])]dnl [AS_VAR_PUSHDEF([ac_Type], [ac_cv_type_$1])]dnl [ac_fn_[]_AC_LANG_ABBREV[]_check_type "$LINENO" "$1" "ac_Type" ]dnl ["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])" AS_VAR_IF([ac_Type], [yes], [$2], [$3]) AS_VAR_POPDEF([ac_Type])dnl ])# _AC_CHECK_TYPE_NEW # _AC_CHECK_TYPES(TYPE) # --------------------- # Helper to AC_CHECK_TYPES, which generates two of the four arguments # to _AC_CHECK_TYPE_NEW that are based on TYPE. m4_define([_AC_CHECK_TYPES], [[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1], [Define to 1 if the system has the type `$1'.])]]) # AC_CHECK_TYPES(TYPES, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # -------------------------------------------------------- # TYPES is an m4 list. There are no ambiguities here, we mean the newer # AC_CHECK_TYPE. AC_DEFUN([AC_CHECK_TYPES], [m4_map_args_sep([_AC_CHECK_TYPE_NEW(_$0(], [)[ $2], [$3], [$4])], [], $1)]) # _AC_CHECK_TYPE_OLD(TYPE, DEFAULT) # --------------------------------- # FIXME: This is an extremely badly chosen name, since this # macro actually performs an AC_REPLACE_TYPE. Some day we # have to clean this up. m4_define([_AC_CHECK_TYPE_OLD], [_AC_CHECK_TYPE_NEW([$1],, [AC_DEFINE_UNQUOTED([$1], [$2], [Define to `$2' if <sys/types.h> does not define.])])dnl ])# _AC_CHECK_TYPE_OLD # _AC_CHECK_TYPE_REPLACEMENT_TYPE_P(STRING) # ----------------------------------------- # Return `1' if STRING seems to be a builtin C/C++ type, i.e., if it # starts with `_Bool', `bool', `char', `double', `float', `int', # `long', `short', `signed', or `unsigned' followed by characters # that are defining types. # Because many people have used `off_t' and `size_t' too, they are added # for better common-use backward compatibility. m4_define([_AC_CHECK_TYPE_REPLACEMENT_TYPE_P], [m4_bmatch([$1], [^\(_Bool\\|bool\\|char\\|double\\|float\\|int\\|long\\|short\\|\(un\)?signed\\|[_a-zA-Z][_a-zA-Z0-9]_t\)[][_a-zA-Z0-9() ]$], 1, 0)dnl ])# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P # _AC_CHECK_TYPE_MAYBE_TYPE_P(STRING) # ----------------------------------- # Return `1' if STRING looks like a C/C++ type. m4_define([_AC_CHECK_TYPE_MAYBE_TYPE_P], [m4_bmatch([$1], [^[_a-zA-Z0-9 ]+\([_a-zA-Z0-9() ]\\|\[\\|\]\)$], 1, 0)dnl ])# _AC_CHECK_TYPE_MAYBE_TYPE_P # AC_CHECK_TYPE(TYPE, DEFAULT) # or # AC_CHECK_TYPE(TYPE, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # ------------------------------------------------------- # # Dispatch respectively to _AC_CHECK_TYPE_OLD or _AC_CHECK_TYPE_NEW. # 1. More than two arguments => NEW # 2. $2 seems to be replacement type => OLD # See _AC_CHECK_TYPE_REPLACEMENT_TYPE_P for `replacement type'. # 3. $2 seems to be a type => NEW plus a warning # 4. default => NEW AC_DEFUN([AC_CHECK_TYPE], [m4_cond([$#], [3], [_AC_CHECK_TYPE_NEW], [$#], [4], [_AC_CHECK_TYPE_NEW], [_AC_CHECK_TYPE_REPLACEMENT_TYPE_P([$2])], [1], [_AC_CHECK_TYPE_OLD], [_AC_CHECK_TYPE_MAYBE_TYPE_P([$2])], [1], [AC_DIAGNOSE([syntax], [$0: assuming `$2' is not a type])_AC_CHECK_TYPE_NEW], [_AC_CHECK_TYPE_NEW])($@)])# AC_CHECK_TYPE # ---------------------------- # # Types that must be checked. # # ---------------------------- # AN_IDENTIFIER([ptrdiff_t], [AC_CHECK_TYPES]) # ----------------- # # Specific checks. # # ----------------- # # AC_TYPE_GETGROUPS # ----------------- AC_DEFUN([AC_TYPE_GETGROUPS], [AC_REQUIRE([AC_TYPE_UID_T])dnl AC_CACHE_CHECK(type of array argument to getgroups, ac_cv_type_getgroups, [AC_RUN_IFELSE([AC_LANG_SOURCE( [[/* Thanks to Mike Rendell for this test. / ]AC_INCLUDES_DEFAULT[ #define NGID 256 #undef MAX #define MAX(x, y) ((x) > (y) ? (x) : (y)) int main () { gid_t gidset[NGID]; int i, n; union { gid_t gval; long int lval; } val; val.lval = -1; for (i = 0; i < NGID; i++) gidset[i] = val.gval; n = getgroups (sizeof (gidset) / MAX (sizeof (int), sizeof (gid_t)) - 1, gidset); / Exit non-zero if getgroups seems to require an array of ints. This happens when gid_t is short int but getgroups modifies an array of ints. / return n > 0 && gidset[n] != val.gval; }]])], [ac_cv_type_getgroups=gid_t], [ac_cv_type_getgroups=int], [ac_cv_type_getgroups=cross]) if test $ac_cv_type_getgroups = cross; then dnl When we can't run the test program (we are cross compiling), presume dnl that <unistd.h> has either an accurate prototype for getgroups or none. dnl Old systems without prototypes probably use int. AC_EGREP_HEADER([getgroups.int.gid_t], unistd.h, ac_cv_type_getgroups=gid_t, ac_cv_type_getgroups=int) fi]) AC_DEFINE_UNQUOTED(GETGROUPS_T, $ac_cv_type_getgroups, [Define to the type of elements in the array set by `getgroups'. Usually this is either `int' or `gid_t'.]) ])# AC_TYPE_GETGROUPS # AU::AM_TYPE_PTRDIFF_T # --------------------- AU_DEFUN([AM_TYPE_PTRDIFF_T], [AC_CHECK_TYPES(ptrdiff_t)]) # AC_TYPE_INTMAX_T # ---------------- AC_DEFUN([AC_TYPE_INTMAX_T], [ AC_REQUIRE([AC_TYPE_LONG_LONG_INT]) AC_CHECK_TYPE([intmax_t], [AC_DEFINE([HAVE_INTMAX_T], 1, [Define to 1 if the system has the type `intmax_t'.])], [test $ac_cv_type_long_long_int = yes \ && ac_type='long long int' \ \|\| ac_type='long int' AC_DEFINE_UNQUOTED([intmax_t], [$ac_type], [Define to the widest signed integer type if <stdint.h> and <inttypes.h> do not define.])]) ]) # AC_TYPE_UINTMAX_T # ----------------- AC_DEFUN([AC_TYPE_UINTMAX_T], [ AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT]) AC_CHECK_TYPE([uintmax_t], [AC_DEFINE([HAVE_UINTMAX_T], 1, [Define to 1 if the system has the type `uintmax_t'.])], [test $ac_cv_type_unsigned_long_long_int = yes \ && ac_type='unsigned long long int' \ \|\| ac_type='unsigned long int' AC_DEFINE_UNQUOTED([uintmax_t], [$ac_type], [Define to the widest unsigned integer type if <stdint.h> and <inttypes.h> do not define.])]) ]) # AC_TYPE_INTPTR_T # ---------------- AC_DEFUN([AC_TYPE_INTPTR_T], [ AC_CHECK_TYPE([intptr_t], [AC_DEFINE([HAVE_INTPTR_T], 1, [Define to 1 if the system has the type `intptr_t'.])], [for ac_type in 'int' 'long int' 'long long int'; do AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [AC_INCLUDES_DEFAULT], [[sizeof (void ) <= sizeof ($ac_type)]])], [AC_DEFINE_UNQUOTED([intptr_t], [$ac_type], [Define to the type of a signed integer type wide enough to hold a pointer, if such a type exists, and if the system does not define it.]) ac_type=]) test -z "$ac_type" && break done]) ]) # AC_TYPE_UINTPTR_T # ----------------- AC_DEFUN([AC_TYPE_UINTPTR_T], [ AC_CHECK_TYPE([uintptr_t], [AC_DEFINE([HAVE_UINTPTR_T], 1, [Define to 1 if the system has the type `uintptr_t'.])], [for ac_type in 'unsigned int' 'unsigned long int' \ 'unsigned long long int'; do AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [AC_INCLUDES_DEFAULT], [[sizeof (void ) <= sizeof ($ac_type)]])], [AC_DEFINE_UNQUOTED([uintptr_t], [$ac_type], [Define to the type of an unsigned integer type wide enough to hold a pointer, if such a type exists, and if the system does not define it.]) ac_type=]) test -z "$ac_type" && break done]) ]) # AC_TYPE_LONG_DOUBLE # ------------------- AC_DEFUN([AC_TYPE_LONG_DOUBLE], [ AC_CACHE_CHECK([for long double], [ac_cv_type_long_double], [if test "$GCC" = yes; then ac_cv_type_long_double=yes else AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [[/ The Stardent Vistra knows sizeof (long double), but does not support it. / long double foo = 0.0L;]], [[/ On Ultrix 4.3 cc, long double is 4 and double is 8. / sizeof (double) <= sizeof (long double)]])], [ac_cv_type_long_double=yes], [ac_cv_type_long_double=no]) fi]) if test $ac_cv_type_long_double = yes; then AC_DEFINE([HAVE_LONG_DOUBLE], 1, [Define to 1 if the system has the type `long double'.]) fi ]) # AC_TYPE_LONG_DOUBLE_WIDER # ------------------------- AC_DEFUN([AC_TYPE_LONG_DOUBLE_WIDER], [ AC_CACHE_CHECK( [for long double with more range or precision than double], [ac_cv_type_long_double_wider], [AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [[#include <float.h> long double const a[] = { 0.0L, DBL_MIN, DBL_MAX, DBL_EPSILON, LDBL_MIN, LDBL_MAX, LDBL_EPSILON }; long double f (long double x) { return ((x + (unsigned long int) 10) (-1 / x) + a[0] + (x ? f (x) : 'c')); } ]], [[(0 < ((DBL_MAX_EXP < LDBL_MAX_EXP) + (DBL_MANT_DIG < LDBL_MANT_DIG) - (LDBL_MAX_EXP < DBL_MAX_EXP) - (LDBL_MANT_DIG < DBL_MANT_DIG))) && (int) LDBL_EPSILON == 0 ]])], ac_cv_type_long_double_wider=yes, ac_cv_type_long_double_wider=no)]) if test $ac_cv_type_long_double_wider = yes; then AC_DEFINE([HAVE_LONG_DOUBLE_WIDER], 1, [Define to 1 if the type `long double' works and has more range or precision than `double'.]) fi ])# AC_TYPE_LONG_DOUBLE_WIDER # AC_C_LONG_DOUBLE # ---------------- AU_DEFUN([AC_C_LONG_DOUBLE], [ AC_TYPE_LONG_DOUBLE_WIDER ac_cv_c_long_double=$ac_cv_type_long_double_wider if test $ac_cv_c_long_double = yes; then AC_DEFINE([HAVE_LONG_DOUBLE], 1, [Define to 1 if the type `long double' works and has more range or precision than `double'.]) fi ], [The macro `AC_C_LONG_DOUBLE' is obsolete. You should use `AC_TYPE_LONG_DOUBLE' or `AC_TYPE_LONG_DOUBLE_WIDER' instead.] ) # _AC_TYPE_LONG_LONG_SNIPPET # -------------------------- # Expands to a C program that can be used to test for simultaneous support # of 'long long' and 'unsigned long long'. We don't want to say that # 'long long' is available if 'unsigned long long' is not, or vice versa, # because too many programs rely on the symmetry between signed and unsigned # integer types (excluding 'bool'). AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET], [ AC_LANG_PROGRAM( [[/* For now, do not test the preprocessor; as of 2007 there are too many implementations with broken preprocessors. Perhaps this can be revisited in 2012. In the meantime, code should not expect #if to work with literals wider than 32 bits. / / Test literals. / long long int ll = 9223372036854775807ll; long long int nll = -9223372036854775807LL; unsigned long long int ull = 18446744073709551615ULL; / Test constant expressions. / typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll) ? 1 : -1)]; typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1 ? 1 : -1)]; int i = 63;]], [[/ Test availability of runtime routines for shift and division. / long long int llmax = 9223372036854775807ll; unsigned long long int ullmax = 18446744073709551615ull; return ((ll << 63) \| (ll >> 63) \| (ll < i) \| (ll > i) \| (llmax / ll) \| (llmax % ll) \| (ull << 63) \| (ull >> 63) \| (ull << i) \| (ull >> i) \| (ullmax / ull) \| (ullmax % ull));]]) ]) # AC_TYPE_LONG_LONG_INT # --------------------- AC_DEFUN([AC_TYPE_LONG_LONG_INT], [ AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT]) AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int], [ac_cv_type_long_long_int=yes if test "x${ac_cv_prog_cc_c99-no}" = xno; then ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int if test $ac_cv_type_long_long_int = yes; then dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004. dnl If cross compiling, assume the bug is not important, since dnl nobody cross compiles for this platform as far as we know. AC_RUN_IFELSE( [AC_LANG_PROGRAM( [[@%:@include <limits.h> @%:@ifndef LLONG_MAX @%:@ define HALF \ (1LL << (sizeof (long long int) CHAR_BIT - 2)) @%:@ define LLONG_MAX (HALF - 1 + HALF) @%:@endif]], [[long long int n = 1; int i; for (i = 0; ; i++) { long long int m = n << i; if (m >> i != n) return 1; if (LLONG_MAX / 2 < m) break; } return 0;]])], [], [ac_cv_type_long_long_int=no], [:]) fi fi]) if test $ac_cv_type_long_long_int = yes; then AC_DEFINE([HAVE_LONG_LONG_INT], [1], [Define to 1 if the system has the type `long long int'.]) fi ]) # AC_TYPE_UNSIGNED_LONG_LONG_INT # ------------------------------ AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT], [ AC_CACHE_CHECK([for unsigned long long int], [ac_cv_type_unsigned_long_long_int], [ac_cv_type_unsigned_long_long_int=yes if test "x${ac_cv_prog_cc_c99-no}" = xno; then AC_LINK_IFELSE( [_AC_TYPE_LONG_LONG_SNIPPET], [], [ac_cv_type_unsigned_long_long_int=no]) fi]) if test $ac_cv_type_unsigned_long_long_int = yes; then AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1], [Define to 1 if the system has the type `unsigned long long int'.]) fi ]) # AC_TYPE_MBSTATE_T # ----------------- AC_DEFUN([AC_TYPE_MBSTATE_T], [AC_CACHE_CHECK([for mbstate_t], ac_cv_type_mbstate_t, [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM( [AC_INCLUDES_DEFAULT # include <wchar.h>], [mbstate_t x; return sizeof x;])], [ac_cv_type_mbstate_t=yes], [ac_cv_type_mbstate_t=no])]) if test $ac_cv_type_mbstate_t = yes; then AC_DEFINE([HAVE_MBSTATE_T], 1, [Define to 1 if <wchar.h> declares mbstate_t.]) else AC_DEFINE([mbstate_t], int, [Define to a type if <wchar.h> does not define.]) fi]) # AC_TYPE_UID_T # ------------- # FIXME: Rewrite using AC_CHECK_TYPE. AN_IDENTIFIER([gid_t], [AC_TYPE_UID_T]) AN_IDENTIFIER([uid_t], [AC_TYPE_UID_T]) AC_DEFUN([AC_TYPE_UID_T], [AC_CACHE_CHECK(for uid_t in sys/types.h, ac_cv_type_uid_t, [AC_EGREP_HEADER(uid_t, sys/types.h, ac_cv_type_uid_t=yes, ac_cv_type_uid_t=no)]) if test $ac_cv_type_uid_t = no; then AC_DEFINE(uid_t, int, [Define to `int' if <sys/types.h> doesn't define.]) AC_DEFINE(gid_t, int, [Define to `int' if <sys/types.h> doesn't define.]) fi ]) AN_IDENTIFIER([size_t], [AC_TYPE_SIZE_T]) AC_DEFUN([AC_TYPE_SIZE_T], [AC_CHECK_TYPE(size_t, unsigned int)]) AN_IDENTIFIER([ssize_t], [AC_TYPE_SSIZE_T]) AC_DEFUN([AC_TYPE_SSIZE_T], [AC_CHECK_TYPE(ssize_t, int)]) AN_IDENTIFIER([pid_t], [AC_TYPE_PID_T]) AC_DEFUN([AC_TYPE_PID_T], [AC_CHECK_TYPE(pid_t, int)]) AN_IDENTIFIER([off_t], [AC_TYPE_OFF_T]) AC_DEFUN([AC_TYPE_OFF_T], [AC_CHECK_TYPE(off_t, long int)]) AN_IDENTIFIER([mode_t], [AC_TYPE_MODE_T]) AC_DEFUN([AC_TYPE_MODE_T], [AC_CHECK_TYPE(mode_t, int)]) AN_IDENTIFIER([int8_t], [AC_TYPE_INT8_T]) AN_IDENTIFIER([int16_t], [AC_TYPE_INT16_T]) AN_IDENTIFIER([int32_t], [AC_TYPE_INT32_T]) AN_IDENTIFIER([int64_t], [AC_TYPE_INT64_T]) AN_IDENTIFIER([uint8_t], [AC_TYPE_UINT8_T]) AN_IDENTIFIER([uint16_t], [AC_TYPE_UINT16_T]) AN_IDENTIFIER([uint32_t], [AC_TYPE_UINT32_T]) AN_IDENTIFIER([uint64_t], [AC_TYPE_UINT64_T]) AC_DEFUN([AC_TYPE_INT8_T], [_AC_TYPE_INT(8)]) AC_DEFUN([AC_TYPE_INT16_T], [_AC_TYPE_INT(16)]) AC_DEFUN([AC_TYPE_INT32_T], [_AC_TYPE_INT(32)]) AC_DEFUN([AC_TYPE_INT64_T], [_AC_TYPE_INT(64)]) AC_DEFUN([AC_TYPE_UINT8_T], [_AC_TYPE_UNSIGNED_INT(8)]) AC_DEFUN([AC_TYPE_UINT16_T], [_AC_TYPE_UNSIGNED_INT(16)]) AC_DEFUN([AC_TYPE_UINT32_T], [_AC_TYPE_UNSIGNED_INT(32)]) AC_DEFUN([AC_TYPE_UINT64_T], [_AC_TYPE_UNSIGNED_INT(64)]) # _AC_TYPE_INT_BODY # ----------------- # Shell function body for _AC_TYPE_INT. m4_define([_AC_TYPE_INT_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for int$[]2_t], [$[]3], [AS_VAR_SET([$[]3], [no]) # Order is important - never check a type that is potentially smaller # than half of the expected target width. for ac_type in int$[]2_t 'int' 'long int' \ 'long long int' 'short int' 'signed char'; do AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [AC_INCLUDES_DEFAULT enum { N = $[]2 / 2 - 1 };], [0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)])], [AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [AC_INCLUDES_DEFAULT enum { N = $[]2 / 2 - 1 };], [($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1) < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 2)])], [], [AS_CASE([$ac_type], [int$[]2_t], [AS_VAR_SET([$[]3], [yes])], [AS_VAR_SET([$[]3], [$ac_type])])])]) AS_VAR_IF([$[]3], [no], [], [break]) done]) AS_LINENO_POP ])# _AC_TYPE_INT_BODY # _AC_TYPE_INT(NBITS) # ------------------- # Set a variable ac_cv_c_intNBITS_t to `yes' if intNBITS_t is available, # `no' if it is not and no replacement types could be found, and a C type # if it is not available but a replacement signed integer type of width # exactly NBITS bits was found. In the third case, intNBITS_t is AC_DEFINEd # to type, as well. AC_DEFUN([_AC_TYPE_INT], [AC_REQUIRE_SHELL_FN([ac_fn_c_find_intX_t], [AS_FUNCTION_DESCRIBE([ac_fn_c_find_intX_t], [LINENO BITS VAR], [Finds a signed integer type with width BITS, setting cache variable VAR accordingly.])], [$0_BODY])]dnl [ac_fn_c_find_intX_t "$LINENO" "$1" "ac_cv_c_int$1_t" case $ac_cv_c_int$1_t in #( no\|yes) ;; #( ) AC_DEFINE_UNQUOTED([int$1_t], [$ac_cv_c_int$1_t], [Define to the type of a signed integer type of width exactly $1 bits if such a type exists and the standard includes do not define it.]);; esac ])# _AC_TYPE_INT # _AC_TYPE_UNSIGNED_INT_BODY # -------------------------- # Shell function body for _AC_TYPE_UNSIGNED_INT. m4_define([_AC_TYPE_UNSIGNED_INT_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for uint$[]2_t], $[]3, [AS_VAR_SET([$[]3], [no]) # Order is important - never check a type that is potentially smaller # than half of the expected target width. for ac_type in uint$[]2_t 'unsigned int' 'unsigned long int' \ 'unsigned long long int' 'unsigned short int' 'unsigned char'; do AC_COMPILE_IFELSE( [AC_LANG_BOOL_COMPILE_TRY( [AC_INCLUDES_DEFAULT], [(($ac_type) -1 >> ($[]2 / 2 - 1)) >> ($[]2 / 2 - 1) == 3])], [AS_CASE([$ac_type], [uint$[]2_t], [AS_VAR_SET([$[]3], [yes])], [AS_VAR_SET([$[]3], [$ac_type])])]) AS_VAR_IF([$[]3], [no], [], [break]) done]) AS_LINENO_POP ])# _AC_TYPE_UNSIGNED_INT_BODY # _AC_TYPE_UNSIGNED_INT(NBITS) # ---------------------------- # Set a variable ac_cv_c_uintNBITS_t to `yes' if uintNBITS_t is available, # `no' if it is not and no replacement types could be found, and a C type # if it is not available but a replacement unsigned integer type of width # exactly NBITS bits was found. In the third case, uintNBITS_t is AC_DEFINEd # to type, as well. AC_DEFUN([_AC_TYPE_UNSIGNED_INT], [AC_REQUIRE_SHELL_FN([ac_fn_c_find_uintX_t], [AS_FUNCTION_DESCRIBE([ac_fn_c_find_uintX_t], [LINENO BITS VAR], [Finds an unsigned integer type with width BITS, setting cache variable VAR accordingly.])], [$0_BODY])]dnl [ac_fn_c_find_uintX_t "$LINENO" "$1" "ac_cv_c_uint$1_t" case $ac_cv_c_uint$1_t in #( no\|yes) ;; #( ) m4_bmatch([$1], [^\(8\\|32\\|64\)$], [AC_DEFINE([_UINT$1_T], 1, [Define for Solaris 2.5.1 so the uint$1_t typedef from <sys/synch.h>, <pthread.h>, or <semaphore.h> is not used. If the typedef were allowed, the #define below would cause a syntax error.])]) AC_DEFINE_UNQUOTED([uint$1_t], [$ac_cv_c_uint$1_t], [Define to the type of an unsigned integer type of width exactly $1 bits if such a type exists and the standard includes do not define it.]);; esac ])# _AC_TYPE_UNSIGNED_INT # AC_TYPE_SIGNAL # -------------- # Note that identifiers starting with SIG are reserved by ANSI C. # C89 requires signal handlers to return void; only K&R returned int; # modern code does not need to worry about using this macro (not to # mention that sigaction is better than signal). AU_DEFUN([AC_TYPE_SIGNAL], [AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal, [AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([#include <sys/types.h> #include <signal.h> ], [return (signal (0, 0)) (0) == 1;])], [ac_cv_type_signal=int], [ac_cv_type_signal=void])]) AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal, [Define as the return type of signal handlers (`int' or `void').]) ], [your code may safely assume C89 semantics that RETSIGTYPE is void. Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.]) ## ------------------------ ## ## Checking size of types. ## ## ------------------------ ## # ---------------- # # Generic checks. # # ---------------- # # AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES]) # --------------------------------------------------------------- AC_DEFUN([AC_CHECK_SIZEOF], [AS_LITERAL_IF(m4_translit([[$1]], [], [p]), [], [m4_fatal([$0: requires literal arguments])])]dnl [# The cast to long int works around a bug in the HP C Compiler # version HP92453-01 B.11.11.23709.GP, which incorrectly rejects # declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'. # This bug is HP SR number 8606223364. _AC_CACHE_CHECK_INT([size of $1], [AS_TR_SH([ac_cv_sizeof_$1])], [(long int) (sizeof ($1))], [AC_INCLUDES_DEFAULT([$3])], [if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then AC_MSG_FAILURE([cannot compute sizeof ($1)], 77) else AS_TR_SH([ac_cv_sizeof_$1])=0 fi]) AC_DEFINE_UNQUOTED(AS_TR_CPP(sizeof_$1), $AS_TR_SH([ac_cv_sizeof_$1]), [The size of `$1', as computed by sizeof.]) ])# AC_CHECK_SIZEOF # AC_CHECK_ALIGNOF(TYPE, [INCLUDES = DEFAULT-INCLUDES]) # ----------------------------------------------------- # TYPE can include braces and semicolon, which AS_TR_CPP and AS_TR_SH # (correctly) recognize as potential shell metacharacters. So we # have to flatten problematic characters ourselves to guarantee that # AC_DEFINE_UNQUOTED will see a literal. AC_DEFUN([AC_CHECK_ALIGNOF], [m4_if(m4_index(m4_translit([[$1]], [`\"], [$]), [$]), [-1], [], [m4_fatal([$0: requires literal arguments])])]dnl [_$0([$1], [$2], m4_translit([[$1]], [{;}], [___]))]) m4_define([_AC_CHECK_ALIGNOF], [# The cast to long int works around a bug in the HP C Compiler, # see AC_CHECK_SIZEOF for more information. _AC_CACHE_CHECK_INT([alignment of $1], [AS_TR_SH([ac_cv_alignof_$3])], [(long int) offsetof (ac__type_alignof_, y)], [AC_INCLUDES_DEFAULT([$2]) #ifndef offsetof # define offsetof(type, member) ((char ) &((type ) 0)->member - (char ) 0) #endif typedef struct { char x; $1 y; } ac__type_alignof_;], [if test "$AS_TR_SH([ac_cv_type_$3])" = yes; then AC_MSG_FAILURE([cannot compute alignment of $1], 77) else AS_TR_SH([ac_cv_alignof_$3])=0 fi]) AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$3), $AS_TR_SH([ac_cv_alignof_$3]), [The normal alignment of `$1', in bytes.]) ])# AC_CHECK_ALIGNOF # AU::AC_INT_16_BITS # ------------------ # What a great name :) AU_DEFUN([AC_INT_16_BITS], [AC_CHECK_SIZEOF([int]) test $ac_cv_sizeof_int = 2 && AC_DEFINE(INT_16_BITS, 1, [Define to 1 if `sizeof (int)' = 2. Obsolete, use `SIZEOF_INT'.]) ], [your code should no longer depend upon `INT_16_BITS', but upon `SIZEOF_INT == 2'. Remove this warning and the `AC_DEFINE' when you adjust the code.]) # AU::AC_LONG_64_BITS # ------------------- AU_DEFUN([AC_LONG_64_BITS], [AC_CHECK_SIZEOF([long int]) test $ac_cv_sizeof_long_int = 8 && AC_DEFINE(LONG_64_BITS, 1, [Define to 1 if `sizeof (long int)' = 8. Obsolete, use `SIZEOF_LONG_INT'.]) ], [your code should no longer depend upon `LONG_64_BITS', but upon `SIZEOF_LONG_INT == 8'. Remove this warning and the `AC_DEFINE' when you adjust the code.]) ## -------------------------- ## ## Generic structure checks. ## ## -------------------------- ## # ---------------- # # Generic checks. # # ---------------- # # _AC_CHECK_MEMBER_BODY # --------------------- # Shell function body for AC_CHECK_MEMBER. m4_define([_AC_CHECK_MEMBER_BODY], [ AS_LINENO_PUSH([$[]1]) AC_CACHE_CHECK([for $[]2.$[]3], [$[]4], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5], [static $[]2 ac_aggr; if (ac_aggr.$[]3) return 0;])], [AS_VAR_SET([$[]4], [yes])], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5], [static $[]2 ac_aggr; if (sizeof ac_aggr.$[]3) return 0;])], [AS_VAR_SET([$[]4], [yes])], [AS_VAR_SET([$[]4], [no])])])]) AS_LINENO_POP ])dnl # AC_CHECK_MEMBER(AGGREGATE.MEMBER, # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # --------------------------------------------------------- # AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell # variables are not a valid argument. AC_DEFUN([AC_CHECK_MEMBER], [AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_member], [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_member], [LINENO AGGR MEMBER VAR INCLUDES], [Tries to find if the field MEMBER exists in type AGGR, after including INCLUDES, setting cache variable VAR accordingly.])], [_$0_BODY])]dnl [AS_LITERAL_IF([$1], [], [m4_fatal([$0: requires literal arguments])])]dnl [m4_if(m4_index([$1], [.]), [-1], [m4_fatal([$0: Did not see any dot in `$1'])])]dnl [AS_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])]dnl [ac_fn_[]_AC_LANG_ABBREV[]_check_member "$LINENO" ]dnl [m4_bpatsubst([$1], [^\([^.]\)\.\(.\)], ["\1" "\2"]) "ac_Member" ]dnl ["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])" AS_VAR_IF([ac_Member], [yes], [$2], [$3]) AS_VAR_POPDEF([ac_Member])dnl ])# AC_CHECK_MEMBER # _AC_CHECK_MEMBERS(AGGREGATE.MEMBER) # ----------------------------------- # Helper to AC_CHECK_MEMBERS, which generates two of the four # arguments to AC_CHECK_MEMBER that are based on AGGREGATE and MEMBER. m4_define([_AC_CHECK_MEMBERS], [[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1], [Define to 1 if `]m4_bpatsubst([$1], [^\([^.]\)\.\(.\)], [[\2' is a member of `\1]])['.])]]) # AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...], # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], # [INCLUDES = DEFAULT-INCLUDES]) # ---------------------------------------------------------- # The first argument is an m4 list. AC_DEFUN([AC_CHECK_MEMBERS], [m4_map_args_sep([AC_CHECK_MEMBER(_$0(], [)[ $2], [$3], [$4])], [], $1)]) # ------------------------------------------------------- # # Members that ought to be tested with AC_CHECK_MEMBERS. # # ------------------------------------------------------- # AN_IDENTIFIER([st_blksize], [AC_CHECK_MEMBERS([struct stat.st_blksize])]) AN_IDENTIFIER([st_rdev], [AC_CHECK_MEMBERS([struct stat.st_rdev])]) # Alphabetic order, please. # _AC_STRUCT_DIRENT(MEMBER) # ------------------------- AC_DEFUN([_AC_STRUCT_DIRENT], [ AC_REQUIRE([AC_HEADER_DIRENT]) AC_CHECK_MEMBERS([struct dirent.$1], [], [], [[ #include <sys/types.h> #ifdef HAVE_DIRENT_H # include <dirent.h> #else # define dirent direct # ifdef HAVE_SYS_NDIR_H # include <sys/ndir.h> # endif # ifdef HAVE_SYS_DIR_H # include <sys/dir.h> # endif # ifdef HAVE_NDIR_H # include <ndir.h> # endif #endif ]]) ]) # AC_STRUCT_DIRENT_D_INO # ---------------------- AC_DEFUN([AC_STRUCT_DIRENT_D_INO], [_AC_STRUCT_DIRENT([d_ino])]) # AC_STRUCT_DIRENT_D_TYPE # ----------------------- AC_DEFUN([AC_STRUCT_DIRENT_D_TYPE], [_AC_STRUCT_DIRENT([d_type])]) # AC_STRUCT_ST_BLKSIZE # -------------------- AU_DEFUN([AC_STRUCT_ST_BLKSIZE], [AC_CHECK_MEMBERS([struct stat.st_blksize], [AC_DEFINE(HAVE_ST_BLKSIZE, 1, [Define to 1 if your `struct stat' has `st_blksize'. Deprecated, use `HAVE_STRUCT_STAT_ST_BLKSIZE' instead.])]) ], [your code should no longer depend upon `HAVE_ST_BLKSIZE', but `HAVE_STRUCT_STAT_ST_BLKSIZE'. Remove this warning and the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_BLKSIZE # AC_STRUCT_ST_BLOCKS # ------------------- # If `struct stat' contains an `st_blocks' member, define # HAVE_STRUCT_STAT_ST_BLOCKS. Otherwise, add `fileblocks.o' to the # output variable LIBOBJS. We still define HAVE_ST_BLOCKS for backward # compatibility. In the future, we will activate specializations for # this macro, so don't obsolete it right now. # # AC_OBSOLETE([$0], [; replace it with # AC_CHECK_MEMBERS([struct stat.st_blocks], # [AC_LIBOBJ([fileblocks])]) # Please note that it will define `HAVE_STRUCT_STAT_ST_BLOCKS', # and not `HAVE_ST_BLOCKS'.])dnl # AN_IDENTIFIER([st_blocks], [AC_STRUCT_ST_BLOCKS]) AC_DEFUN([AC_STRUCT_ST_BLOCKS], [AC_CHECK_MEMBERS([struct stat.st_blocks], [AC_DEFINE(HAVE_ST_BLOCKS, 1, [Define to 1 if your `struct stat' has `st_blocks'. Deprecated, use `HAVE_STRUCT_STAT_ST_BLOCKS' instead.])], [AC_LIBOBJ([fileblocks])]) ])# AC_STRUCT_ST_BLOCKS # AC_STRUCT_ST_RDEV # ----------------- AU_DEFUN([AC_STRUCT_ST_RDEV], [AC_CHECK_MEMBERS([struct stat.st_rdev], [AC_DEFINE(HAVE_ST_RDEV, 1, [Define to 1 if your `struct stat' has `st_rdev'. Deprecated, use `HAVE_STRUCT_STAT_ST_RDEV' instead.])]) ], [your code should no longer depend upon `HAVE_ST_RDEV', but `HAVE_STRUCT_STAT_ST_RDEV'. Remove this warning and the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_RDEV # AC_STRUCT_TM # ------------ # FIXME: This macro is badly named, it should be AC_CHECK_TYPE_STRUCT_TM. # Or something else, but what? AC_CHECK_TYPE_STRUCT_TM_IN_SYS_TIME? AC_DEFUN([AC_STRUCT_TM], [AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h], ac_cv_struct_tm, [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h> #include <time.h> ], [struct tm tm; int p = &tm.tm_sec; return !p;])], [ac_cv_struct_tm=time.h], [ac_cv_struct_tm=sys/time.h])]) if test $ac_cv_struct_tm = sys/time.h; then AC_DEFINE(TM_IN_SYS_TIME, 1, [Define to 1 if your <sys/time.h> declares `struct tm'.]) fi ])# AC_STRUCT_TM # AC_STRUCT_TIMEZONE # ------------------ # Figure out how to get the current timezone. If `struct tm' has a # `tm_zone' member, define `HAVE_TM_ZONE'. Otherwise, if the # external array `tzname' is found, define `HAVE_TZNAME'. AN_IDENTIFIER([tm_zone], [AC_STRUCT_TIMEZONE]) AC_DEFUN([AC_STRUCT_TIMEZONE], [AC_REQUIRE([AC_STRUCT_TM])dnl AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h> #include <$ac_cv_struct_tm> ]) if test "$ac_cv_member_struct_tm_tm_zone" = yes; then AC_DEFINE(HAVE_TM_ZONE, 1, [Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use `HAVE_STRUCT_TM_TM_ZONE' instead.]) else AC_CHECK_DECLS([tzname], , , [#include <time.h>]) AC_CACHE_CHECK(for tzname, ac_cv_var_tzname, [AC_LINK_IFELSE([AC_LANG_PROGRAM( [[#include <time.h> #if !HAVE_DECL_TZNAME extern char *tzname[]; #endif ]], [[return tzname[0][0];]])], [ac_cv_var_tzname=yes], [ac_cv_var_tzname=no])]) if test $ac_cv_var_tzname = yes; then AC_DEFINE(HAVE_TZNAME, 1, [Define to 1 if you don't have `tm_zone' but do have the external array `tzname'.]) fi fi ])# AC_STRUCT_TIMEZONE Back

Edit File : types.m4 | Size : 35.34 KB

# This file is part of Autoconf.			-*- Autoconf -*-
# Type related macros: existence, sizeof, and structure members.
#
# Copyright (C) 2000-2002, 2004-2012 Free Software Foundation, Inc.

# This file is part of Autoconf.  This program is free
# software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the
# Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# Under Section 7 of GPL version 3, you are granted additional
# permissions described in the Autoconf Configure Script Exception,
# version 3.0, as published by the Free Software Foundation.
#
# You should have received a copy of the GNU General Public License
# and a copy of the Autoconf Configure Script Exception along with
# this program; see the files COPYINGv3 and COPYING.EXCEPTION
# respectively.  If not, see <http://www.gnu.org/licenses/>.

# Written by David MacKenzie, with help from
# Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
# Roland McGrath, Noah Friedman, david d zuhn, and many others.

## ---------------- ##
## Type existence.  ##
## ---------------- ##

# ---------------- #
# General checks.  #
# ---------------- #

# Up to 2.13 included, Autoconf used to provide the macro
#
#    AC_CHECK_TYPE(TYPE, DEFAULT)
#
# Since, it provides another version which fits better with the other
# AC_CHECK_ families:
#
#    AC_CHECK_TYPE(TYPE,
#		   [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		   [INCLUDES = DEFAULT-INCLUDES])
#
# In order to provide backward compatibility, the new scheme is
# implemented as _AC_CHECK_TYPE_NEW, the old scheme as _AC_CHECK_TYPE_OLD,
# and AC_CHECK_TYPE branches to one or the other, depending upon its
# arguments.

# _AC_CHECK_TYPE_NEW_BODY
# -----------------------
# Shell function body for _AC_CHECK_TYPE_NEW.  This macro implements the
# former task of AC_CHECK_TYPE, with one big difference though: AC_CHECK_TYPE
# used to grep in the headers, which, BTW, led to many problems until the
# extended regular expression was correct and did not give false positives.
# It turned out there are even portability issues with egrep...
#
# The most obvious way to check for a TYPE is just to compile a variable
# definition:
#
#	  TYPE my_var;
#
# (TYPE being the second parameter to the shell function, hence $[]2 in m4).
# Unfortunately this does not work for const qualified types in C++, where
# you need an initializer.  So you think of
#
#	  TYPE my_var = (TYPE) 0;
#
# Unfortunately, again, this is not valid for some C++ classes.
#
# Then you look for another scheme.  For instance you think of declaring
# a function which uses a parameter of type TYPE:
#
#	  int foo (TYPE param);
#
# but of course you soon realize this does not make it with K&R
# compilers.  And by no means do you want to use this:
#
#	  int foo (param)
#	    TYPE param
#	  { ; }
#
# since C++ would complain loudly.
#
# Don't even think of using a function return type, since K&R cries
# there too.  So you start thinking of declaring a *pointer* to this TYPE:
#
#	  TYPE *p;
#
# but you know fairly well that this is legal in C for aggregates which
# are unknown (TYPE = struct does-not-exist).
#
# Then you think of using sizeof to make sure the TYPE is really
# defined:
#
#	  sizeof (TYPE);
#
# That is great, but has one drawback: it succeeds when TYPE happens
# to be a variable: you'd get the size of the variable's type.
# Obviously, we must not accept a variable in place of a type name.
#
# So, to filter out the last possibility, we will require that this fail:
#
#	  sizeof ((TYPE));
#
# This evokes a syntax error when TYPE is a type, but succeeds if TYPE
# is actually a variable.
#
# Also note that we use
#
#	  if (sizeof (TYPE))
#
# to `read' sizeof (to avoid warnings), while not depending on its type
# (not necessarily size_t etc.).
#
# C++ disallows defining types inside `sizeof ()', but that's OK,
# since we don't want to consider unnamed structs to be types for C++,
# precisely because they don't work in cases like that.
m4_define([_AC_CHECK_TYPE_NEW_BODY],
[  AS_LINENO_PUSH([$[]1])
  AC_CACHE_CHECK([for $[]2], [$[]3],
  [AS_VAR_SET([$[]3], [no])
  AC_COMPILE_IFELSE(
    [AC_LANG_PROGRAM([$[]4],
       [if (sizeof ($[]2))
	 return 0;])],
    [AC_COMPILE_IFELSE(
       [AC_LANG_PROGRAM([$[]4],
	  [if (sizeof (($[]2)))
	    return 0;])],
       [],
       [AS_VAR_SET([$[]3], [yes])])])])
  AS_LINENO_POP
])dnl

# _AC_CHECK_TYPE_NEW(TYPE,
#		     [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		     [INCLUDES = DEFAULT-INCLUDES])
# ------------------------------------------------------------
# Check whether the type TYPE is supported by the system, maybe via the
# the provided includes.
AC_DEFUN([_AC_CHECK_TYPE_NEW],
[AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_type],
  [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_type],
    [LINENO TYPE VAR INCLUDES],
    [Tests whether TYPE exists after having included INCLUDES, setting
     cache variable VAR accordingly.])],
    [$0_BODY])]dnl
[AS_VAR_PUSHDEF([ac_Type], [ac_cv_type_$1])]dnl
[ac_fn_[]_AC_LANG_ABBREV[]_check_type "$LINENO" "$1" "ac_Type" ]dnl
["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])"
AS_VAR_IF([ac_Type], [yes], [$2], [$3])
AS_VAR_POPDEF([ac_Type])dnl
])# _AC_CHECK_TYPE_NEW

# _AC_CHECK_TYPES(TYPE)
# ---------------------
# Helper to AC_CHECK_TYPES, which generates two of the four arguments
# to _AC_CHECK_TYPE_NEW that are based on TYPE.
m4_define([_AC_CHECK_TYPES],
[[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1],
  [Define to 1 if the system has the type `$1'.])]])

# AC_CHECK_TYPES(TYPES,
#		 [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		 [INCLUDES = DEFAULT-INCLUDES])
# --------------------------------------------------------
# TYPES is an m4 list.  There are no ambiguities here, we mean the newer
# AC_CHECK_TYPE.
AC_DEFUN([AC_CHECK_TYPES],
[m4_map_args_sep([_AC_CHECK_TYPE_NEW(_$0(], [)[
$2], [$3], [$4])], [], $1)])

# _AC_CHECK_TYPE_OLD(TYPE, DEFAULT)
# ---------------------------------
# FIXME: This is an extremely badly chosen name, since this
# macro actually performs an AC_REPLACE_TYPE.  Some day we
# have to clean this up.
m4_define([_AC_CHECK_TYPE_OLD],
[_AC_CHECK_TYPE_NEW([$1],,
   [AC_DEFINE_UNQUOTED([$1], [$2],
		       [Define to `$2' if <sys/types.h> does not define.])])dnl
])# _AC_CHECK_TYPE_OLD

# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P(STRING)
# -----------------------------------------
# Return `1' if STRING seems to be a builtin C/C++ type, i.e., if it
# starts with `_Bool', `bool', `char', `double', `float', `int',
# `long', `short', `signed', or `unsigned' followed by characters
# that are defining types.
# Because many people have used `off_t' and `size_t' too, they are added
# for better common-use backward compatibility.
m4_define([_AC_CHECK_TYPE_REPLACEMENT_TYPE_P],
[m4_bmatch([$1],
	  [^$_Bool\|bool\|char\|double\|float\|int\|long\|short\|\(un$?signed\|[_a-zA-Z][_a-zA-Z0-9]*_t\)[][_a-zA-Z0-9() *]*$],
	  1, 0)dnl
])# _AC_CHECK_TYPE_REPLACEMENT_TYPE_P

# _AC_CHECK_TYPE_MAYBE_TYPE_P(STRING)
# -----------------------------------
# Return `1' if STRING looks like a C/C++ type.
m4_define([_AC_CHECK_TYPE_MAYBE_TYPE_P],
[m4_bmatch([$1], [^[_a-zA-Z0-9 ]+$[_a-zA-Z0-9() *]\|\[\|\]$*$],
	  1, 0)dnl
])# _AC_CHECK_TYPE_MAYBE_TYPE_P

# AC_CHECK_TYPE(TYPE, DEFAULT)
#  or
# AC_CHECK_TYPE(TYPE,
#		[ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		[INCLUDES = DEFAULT-INCLUDES])
# -------------------------------------------------------
#
# Dispatch respectively to _AC_CHECK_TYPE_OLD or _AC_CHECK_TYPE_NEW.
# 1. More than two arguments	     => NEW
# 2. $2 seems to be replacement type => OLD
#    See _AC_CHECK_TYPE_REPLACEMENT_TYPE_P for `replacement type'.
# 3. $2 seems to be a type	     => NEW plus a warning
# 4. default			     => NEW
AC_DEFUN([AC_CHECK_TYPE],
[m4_cond([$#], [3],
  [_AC_CHECK_TYPE_NEW],
	 [$#], [4],
  [_AC_CHECK_TYPE_NEW],
	 [_AC_CHECK_TYPE_REPLACEMENT_TYPE_P([$2])], [1],
  [_AC_CHECK_TYPE_OLD],
	 [_AC_CHECK_TYPE_MAYBE_TYPE_P([$2])], [1],
  [AC_DIAGNOSE([syntax],
	       [$0: assuming `$2' is not a type])_AC_CHECK_TYPE_NEW],
  [_AC_CHECK_TYPE_NEW])($@)])# AC_CHECK_TYPE

# ---------------------------- #
# Types that must be checked.  #
# ---------------------------- #

AN_IDENTIFIER([ptrdiff_t], [AC_CHECK_TYPES])

# ----------------- #
# Specific checks.  #
# ----------------- #

# AC_TYPE_GETGROUPS
# -----------------
AC_DEFUN([AC_TYPE_GETGROUPS],
[AC_REQUIRE([AC_TYPE_UID_T])dnl
AC_CACHE_CHECK(type of array argument to getgroups, ac_cv_type_getgroups,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[/* Thanks to Mike Rendell for this test.  */
]AC_INCLUDES_DEFAULT[
#define NGID 256
#undef MAX
#define MAX(x, y) ((x) > (y) ? (x) : (y))

int
main ()
{
  gid_t gidset[NGID];
  int i, n;
  union { gid_t gval; long int lval; }  val;

val.lval = -1;
  for (i = 0; i < NGID; i++)
    gidset[i] = val.gval;
  n = getgroups (sizeof (gidset) / MAX (sizeof (int), sizeof (gid_t)) - 1,
		 gidset);
  /* Exit non-zero if getgroups seems to require an array of ints.  This
     happens when gid_t is short int but getgroups modifies an array
     of ints.  */
  return n > 0 && gidset[n] != val.gval;
}]])],
	       [ac_cv_type_getgroups=gid_t],
	       [ac_cv_type_getgroups=int],
	       [ac_cv_type_getgroups=cross])
if test $ac_cv_type_getgroups = cross; then
  dnl When we can't run the test program (we are cross compiling), presume
  dnl that <unistd.h> has either an accurate prototype for getgroups or none.
  dnl Old systems without prototypes probably use int.
  AC_EGREP_HEADER([getgroups.*int.*gid_t], unistd.h,
		  ac_cv_type_getgroups=gid_t, ac_cv_type_getgroups=int)
fi])
AC_DEFINE_UNQUOTED(GETGROUPS_T, $ac_cv_type_getgroups,
		   [Define to the type of elements in the array set by
		    `getgroups'. Usually this is either `int' or `gid_t'.])
])# AC_TYPE_GETGROUPS

# AU::AM_TYPE_PTRDIFF_T
# ---------------------
AU_DEFUN([AM_TYPE_PTRDIFF_T],
[AC_CHECK_TYPES(ptrdiff_t)])

# AC_TYPE_INTMAX_T
# ----------------
AC_DEFUN([AC_TYPE_INTMAX_T],
[
  AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
  AC_CHECK_TYPE([intmax_t],
    [AC_DEFINE([HAVE_INTMAX_T], 1,
       [Define to 1 if the system has the type `intmax_t'.])],
    [test $ac_cv_type_long_long_int = yes \
       && ac_type='long long int' \
       || ac_type='long int'
     AC_DEFINE_UNQUOTED([intmax_t], [$ac_type],
       [Define to the widest signed integer type
	if <stdint.h> and <inttypes.h> do not define.])])
])

# AC_TYPE_UINTMAX_T
# -----------------
AC_DEFUN([AC_TYPE_UINTMAX_T],
[
  AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
  AC_CHECK_TYPE([uintmax_t],
    [AC_DEFINE([HAVE_UINTMAX_T], 1,
       [Define to 1 if the system has the type `uintmax_t'.])],
    [test $ac_cv_type_unsigned_long_long_int = yes \
       && ac_type='unsigned long long int' \
       || ac_type='unsigned long int'
     AC_DEFINE_UNQUOTED([uintmax_t], [$ac_type],
       [Define to the widest unsigned integer type
	if <stdint.h> and <inttypes.h> do not define.])])
])

# AC_TYPE_INTPTR_T
# ----------------
AC_DEFUN([AC_TYPE_INTPTR_T],
[
  AC_CHECK_TYPE([intptr_t],
    [AC_DEFINE([HAVE_INTPTR_T], 1,
       [Define to 1 if the system has the type `intptr_t'.])],
    [for ac_type in 'int' 'long int' 'long long int'; do
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [AC_INCLUDES_DEFAULT],
	    [[sizeof (void *) <= sizeof ($ac_type)]])],
	 [AC_DEFINE_UNQUOTED([intptr_t], [$ac_type],
	    [Define to the type of a signed integer type wide enough to
	     hold a pointer, if such a type exists, and if the system
	     does not define it.])
	  ac_type=])
       test -z "$ac_type" && break
     done])
])

# AC_TYPE_UINTPTR_T
# -----------------
AC_DEFUN([AC_TYPE_UINTPTR_T],
[
  AC_CHECK_TYPE([uintptr_t],
    [AC_DEFINE([HAVE_UINTPTR_T], 1,
       [Define to 1 if the system has the type `uintptr_t'.])],
    [for ac_type in 'unsigned int' 'unsigned long int' \
	'unsigned long long int'; do
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [AC_INCLUDES_DEFAULT],
	    [[sizeof (void *) <= sizeof ($ac_type)]])],
	 [AC_DEFINE_UNQUOTED([uintptr_t], [$ac_type],
	    [Define to the type of an unsigned integer type wide enough to
	     hold a pointer, if such a type exists, and if the system
	     does not define it.])
	  ac_type=])
       test -z "$ac_type" && break
     done])
])

# AC_TYPE_LONG_DOUBLE
# -------------------
AC_DEFUN([AC_TYPE_LONG_DOUBLE],
[
  AC_CACHE_CHECK([for long double], [ac_cv_type_long_double],
    [if test "$GCC" = yes; then
       ac_cv_type_long_double=yes
     else
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [[/* The Stardent Vistra knows sizeof (long double), but does
		 not support it.  */
	      long double foo = 0.0L;]],
	    [[/* On Ultrix 4.3 cc, long double is 4 and double is 8.  */
	      sizeof (double) <= sizeof (long double)]])],
	 [ac_cv_type_long_double=yes],
	 [ac_cv_type_long_double=no])
     fi])
  if test $ac_cv_type_long_double = yes; then
    AC_DEFINE([HAVE_LONG_DOUBLE], 1,
      [Define to 1 if the system has the type `long double'.])
  fi
])

# AC_TYPE_LONG_DOUBLE_WIDER
# -------------------------
AC_DEFUN([AC_TYPE_LONG_DOUBLE_WIDER],
[
  AC_CACHE_CHECK(
    [for long double with more range or precision than double],
    [ac_cv_type_long_double_wider],
    [AC_COMPILE_IFELSE(
       [AC_LANG_BOOL_COMPILE_TRY(
	  [[#include <float.h>
	    long double const a[] =
	      {
		 0.0L, DBL_MIN, DBL_MAX, DBL_EPSILON,
		 LDBL_MIN, LDBL_MAX, LDBL_EPSILON
	      };
	    long double
	    f (long double x)
	    {
	       return ((x + (unsigned long int) 10) * (-1 / x) + a[0]
			+ (x ? f (x) : 'c'));
	    }
	  ]],
	  [[(0 < ((DBL_MAX_EXP < LDBL_MAX_EXP)
		   + (DBL_MANT_DIG < LDBL_MANT_DIG)
		   - (LDBL_MAX_EXP < DBL_MAX_EXP)
		   - (LDBL_MANT_DIG < DBL_MANT_DIG)))
	    && (int) LDBL_EPSILON == 0
	  ]])],
       ac_cv_type_long_double_wider=yes,
       ac_cv_type_long_double_wider=no)])
  if test $ac_cv_type_long_double_wider = yes; then
    AC_DEFINE([HAVE_LONG_DOUBLE_WIDER], 1,
      [Define to 1 if the type `long double' works and has more range or
       precision than `double'.])
  fi
])# AC_TYPE_LONG_DOUBLE_WIDER

# AC_C_LONG_DOUBLE
# ----------------
AU_DEFUN([AC_C_LONG_DOUBLE],
  [
    AC_TYPE_LONG_DOUBLE_WIDER
    ac_cv_c_long_double=$ac_cv_type_long_double_wider
    if test $ac_cv_c_long_double = yes; then
      AC_DEFINE([HAVE_LONG_DOUBLE], 1,
	[Define to 1 if the type `long double' works and has more range or
	 precision than `double'.])
    fi
  ],
  [The macro `AC_C_LONG_DOUBLE' is obsolete.
You should use `AC_TYPE_LONG_DOUBLE' or `AC_TYPE_LONG_DOUBLE_WIDER' instead.]
)

# _AC_TYPE_LONG_LONG_SNIPPET
# --------------------------
# Expands to a C program that can be used to test for simultaneous support
# of 'long long' and 'unsigned long long'. We don't want to say that
# 'long long' is available if 'unsigned long long' is not, or vice versa,
# because too many programs rely on the symmetry between signed and unsigned
# integer types (excluding 'bool').
AC_DEFUN([_AC_TYPE_LONG_LONG_SNIPPET],
[
  AC_LANG_PROGRAM(
    [[/* For now, do not test the preprocessor; as of 2007 there are too many
	 implementations with broken preprocessors.  Perhaps this can
	 be revisited in 2012.  In the meantime, code should not expect
	 #if to work with literals wider than 32 bits.  */
      /* Test literals.  */
      long long int ll = 9223372036854775807ll;
      long long int nll = -9223372036854775807LL;
      unsigned long long int ull = 18446744073709551615ULL;
      /* Test constant expressions.   */
      typedef int a[((-9223372036854775807LL < 0 && 0 < 9223372036854775807ll)
		     ? 1 : -1)];
      typedef int b[(18446744073709551615ULL <= (unsigned long long int) -1
		     ? 1 : -1)];
      int i = 63;]],
    [[/* Test availability of runtime routines for shift and division.  */
      long long int llmax = 9223372036854775807ll;
      unsigned long long int ullmax = 18446744073709551615ull;
      return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
	      | (llmax / ll) | (llmax % ll)
	      | (ull << 63) | (ull >> 63) | (ull << i) | (ull >> i)
	      | (ullmax / ull) | (ullmax % ull));]])
])

# AC_TYPE_LONG_LONG_INT
# ---------------------
AC_DEFUN([AC_TYPE_LONG_LONG_INT],
[
  AC_REQUIRE([AC_TYPE_UNSIGNED_LONG_LONG_INT])
  AC_CACHE_CHECK([for long long int], [ac_cv_type_long_long_int],
     [ac_cv_type_long_long_int=yes
      if test "x${ac_cv_prog_cc_c99-no}" = xno; then
	ac_cv_type_long_long_int=$ac_cv_type_unsigned_long_long_int
	if test $ac_cv_type_long_long_int = yes; then
	  dnl Catch a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
	  dnl If cross compiling, assume the bug is not important, since
	  dnl nobody cross compiles for this platform as far as we know.
	  AC_RUN_IFELSE(
	    [AC_LANG_PROGRAM(
	       [[@%:@include <limits.h>
		 @%:@ifndef LLONG_MAX
		 @%:@ define HALF \
			  (1LL << (sizeof (long long int) * CHAR_BIT - 2))
		 @%:@ define LLONG_MAX (HALF - 1 + HALF)
		 @%:@endif]],
	       [[long long int n = 1;
		 int i;
		 for (i = 0; ; i++)
		   {
		     long long int m = n << i;
		     if (m >> i != n)
		       return 1;
		     if (LLONG_MAX / 2 < m)
		       break;
		   }
		 return 0;]])],
	    [],
	    [ac_cv_type_long_long_int=no],
	    [:])
	fi
      fi])
  if test $ac_cv_type_long_long_int = yes; then
    AC_DEFINE([HAVE_LONG_LONG_INT], [1],
      [Define to 1 if the system has the type `long long int'.])
  fi
])

# AC_TYPE_UNSIGNED_LONG_LONG_INT
# ------------------------------
AC_DEFUN([AC_TYPE_UNSIGNED_LONG_LONG_INT],
[
  AC_CACHE_CHECK([for unsigned long long int],
    [ac_cv_type_unsigned_long_long_int],
    [ac_cv_type_unsigned_long_long_int=yes
     if test "x${ac_cv_prog_cc_c99-no}" = xno; then
       AC_LINK_IFELSE(
	 [_AC_TYPE_LONG_LONG_SNIPPET],
	 [],
	 [ac_cv_type_unsigned_long_long_int=no])
     fi])
  if test $ac_cv_type_unsigned_long_long_int = yes; then
    AC_DEFINE([HAVE_UNSIGNED_LONG_LONG_INT], [1],
      [Define to 1 if the system has the type `unsigned long long int'.])
  fi
])

# AC_TYPE_MBSTATE_T
# -----------------
AC_DEFUN([AC_TYPE_MBSTATE_T],
  [AC_CACHE_CHECK([for mbstate_t], ac_cv_type_mbstate_t,
     [AC_COMPILE_IFELSE(
	[AC_LANG_PROGRAM(
	   [AC_INCLUDES_DEFAULT
#	    include <wchar.h>],
	   [mbstate_t x; return sizeof x;])],
	[ac_cv_type_mbstate_t=yes],
	[ac_cv_type_mbstate_t=no])])
   if test $ac_cv_type_mbstate_t = yes; then
     AC_DEFINE([HAVE_MBSTATE_T], 1,
	       [Define to 1 if <wchar.h> declares mbstate_t.])
   else
     AC_DEFINE([mbstate_t], int,
	       [Define to a type if <wchar.h> does not define.])
   fi])

# AC_TYPE_UID_T
# -------------
# FIXME: Rewrite using AC_CHECK_TYPE.
AN_IDENTIFIER([gid_t], [AC_TYPE_UID_T])
AN_IDENTIFIER([uid_t], [AC_TYPE_UID_T])
AC_DEFUN([AC_TYPE_UID_T],
[AC_CACHE_CHECK(for uid_t in sys/types.h, ac_cv_type_uid_t,
[AC_EGREP_HEADER(uid_t, sys/types.h,
  ac_cv_type_uid_t=yes, ac_cv_type_uid_t=no)])
if test $ac_cv_type_uid_t = no; then
  AC_DEFINE(uid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
  AC_DEFINE(gid_t, int, [Define to `int' if <sys/types.h> doesn't define.])
fi
])

AN_IDENTIFIER([size_t], [AC_TYPE_SIZE_T])
AC_DEFUN([AC_TYPE_SIZE_T], [AC_CHECK_TYPE(size_t, unsigned int)])

AN_IDENTIFIER([ssize_t], [AC_TYPE_SSIZE_T])
AC_DEFUN([AC_TYPE_SSIZE_T], [AC_CHECK_TYPE(ssize_t, int)])

AN_IDENTIFIER([pid_t], [AC_TYPE_PID_T])
AC_DEFUN([AC_TYPE_PID_T],  [AC_CHECK_TYPE(pid_t,  int)])

AN_IDENTIFIER([off_t], [AC_TYPE_OFF_T])
AC_DEFUN([AC_TYPE_OFF_T],  [AC_CHECK_TYPE(off_t,  long int)])

AN_IDENTIFIER([mode_t], [AC_TYPE_MODE_T])
AC_DEFUN([AC_TYPE_MODE_T], [AC_CHECK_TYPE(mode_t, int)])

AN_IDENTIFIER([int8_t], [AC_TYPE_INT8_T])
AN_IDENTIFIER([int16_t], [AC_TYPE_INT16_T])
AN_IDENTIFIER([int32_t], [AC_TYPE_INT32_T])
AN_IDENTIFIER([int64_t], [AC_TYPE_INT64_T])
AN_IDENTIFIER([uint8_t], [AC_TYPE_UINT8_T])
AN_IDENTIFIER([uint16_t], [AC_TYPE_UINT16_T])
AN_IDENTIFIER([uint32_t], [AC_TYPE_UINT32_T])
AN_IDENTIFIER([uint64_t], [AC_TYPE_UINT64_T])
AC_DEFUN([AC_TYPE_INT8_T], [_AC_TYPE_INT(8)])
AC_DEFUN([AC_TYPE_INT16_T], [_AC_TYPE_INT(16)])
AC_DEFUN([AC_TYPE_INT32_T], [_AC_TYPE_INT(32)])
AC_DEFUN([AC_TYPE_INT64_T], [_AC_TYPE_INT(64)])
AC_DEFUN([AC_TYPE_UINT8_T], [_AC_TYPE_UNSIGNED_INT(8)])
AC_DEFUN([AC_TYPE_UINT16_T], [_AC_TYPE_UNSIGNED_INT(16)])
AC_DEFUN([AC_TYPE_UINT32_T], [_AC_TYPE_UNSIGNED_INT(32)])
AC_DEFUN([AC_TYPE_UINT64_T], [_AC_TYPE_UNSIGNED_INT(64)])

# _AC_TYPE_INT_BODY
# -----------------
# Shell function body for _AC_TYPE_INT.
m4_define([_AC_TYPE_INT_BODY],
[  AS_LINENO_PUSH([$[]1])
  AC_CACHE_CHECK([for int$[]2_t], [$[]3],
    [AS_VAR_SET([$[]3], [no])
     # Order is important - never check a type that is potentially smaller
     # than half of the expected target width.
     for ac_type in int$[]2_t 'int' 'long int' \
	 'long long int' 'short int' 'signed char'; do
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [AC_INCLUDES_DEFAULT
	     enum { N = $[]2 / 2 - 1 };],
	    [0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)])],
	 [AC_COMPILE_IFELSE(
	    [AC_LANG_BOOL_COMPILE_TRY(
	       [AC_INCLUDES_DEFAULT
	        enum { N = $[]2 / 2 - 1 };],
	       [($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)
		 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 2)])],
	    [],
	    [AS_CASE([$ac_type], [int$[]2_t],
	       [AS_VAR_SET([$[]3], [yes])],
	       [AS_VAR_SET([$[]3], [$ac_type])])])])
       AS_VAR_IF([$[]3], [no], [], [break])
     done])
  AS_LINENO_POP
])# _AC_TYPE_INT_BODY

# _AC_TYPE_INT(NBITS)
# -------------------
# Set a variable ac_cv_c_intNBITS_t to `yes' if intNBITS_t is available,
# `no' if it is not and no replacement types could be found, and a C type
# if it is not available but a replacement signed integer type of width
# exactly NBITS bits was found.  In the third case, intNBITS_t is AC_DEFINEd
# to type, as well.
AC_DEFUN([_AC_TYPE_INT],
[AC_REQUIRE_SHELL_FN([ac_fn_c_find_intX_t],
  [AS_FUNCTION_DESCRIBE([ac_fn_c_find_intX_t], [LINENO BITS VAR],
    [Finds a signed integer type with width BITS, setting cache variable VAR
     accordingly.])],
    [$0_BODY])]dnl
[ac_fn_c_find_intX_t "$LINENO" "$1" "ac_cv_c_int$1_t"
case $ac_cv_c_int$1_t in #(
  no|yes) ;; #(
  *)
    AC_DEFINE_UNQUOTED([int$1_t], [$ac_cv_c_int$1_t],
      [Define to the type of a signed integer type of width exactly $1 bits
       if such a type exists and the standard includes do not define it.]);;
esac
])# _AC_TYPE_INT

# _AC_TYPE_UNSIGNED_INT_BODY
# --------------------------
# Shell function body for _AC_TYPE_UNSIGNED_INT.
m4_define([_AC_TYPE_UNSIGNED_INT_BODY],
[  AS_LINENO_PUSH([$[]1])
  AC_CACHE_CHECK([for uint$[]2_t], $[]3,
    [AS_VAR_SET([$[]3], [no])
     # Order is important - never check a type that is potentially smaller
     # than half of the expected target width.
     for ac_type in uint$[]2_t 'unsigned int' 'unsigned long int' \
	 'unsigned long long int' 'unsigned short int' 'unsigned char'; do
       AC_COMPILE_IFELSE(
	 [AC_LANG_BOOL_COMPILE_TRY(
	    [AC_INCLUDES_DEFAULT],
	    [(($ac_type) -1 >> ($[]2 / 2 - 1)) >> ($[]2 / 2 - 1) == 3])],
	 [AS_CASE([$ac_type], [uint$[]2_t],
	    [AS_VAR_SET([$[]3], [yes])],
	    [AS_VAR_SET([$[]3], [$ac_type])])])
       AS_VAR_IF([$[]3], [no], [], [break])
     done])
  AS_LINENO_POP
])# _AC_TYPE_UNSIGNED_INT_BODY

# _AC_TYPE_UNSIGNED_INT(NBITS)
# ----------------------------
# Set a variable ac_cv_c_uintNBITS_t to `yes' if uintNBITS_t is available,
# `no' if it is not and no replacement types could be found, and a C type
# if it is not available but a replacement unsigned integer type of width
# exactly NBITS bits was found.  In the third case, uintNBITS_t is AC_DEFINEd
# to type, as well.
AC_DEFUN([_AC_TYPE_UNSIGNED_INT],
[AC_REQUIRE_SHELL_FN([ac_fn_c_find_uintX_t],
  [AS_FUNCTION_DESCRIBE([ac_fn_c_find_uintX_t], [LINENO BITS VAR],
    [Finds an unsigned integer type with width BITS, setting cache variable VAR
     accordingly.])],
  [$0_BODY])]dnl
[ac_fn_c_find_uintX_t "$LINENO" "$1" "ac_cv_c_uint$1_t"
case $ac_cv_c_uint$1_t in #(
  no|yes) ;; #(
  *)
    m4_bmatch([$1], [^$8\|32\|64$$],
      [AC_DEFINE([_UINT$1_T], 1,
	 [Define for Solaris 2.5.1 so the uint$1_t typedef from
	  <sys/synch.h>, <pthread.h>, or <semaphore.h> is not used.
	  If the typedef were allowed, the #define below would cause a
	  syntax error.])])
    AC_DEFINE_UNQUOTED([uint$1_t], [$ac_cv_c_uint$1_t],
      [Define to the type of an unsigned integer type of width exactly $1 bits
       if such a type exists and the standard includes do not define it.]);;
  esac
])# _AC_TYPE_UNSIGNED_INT

# AC_TYPE_SIGNAL
# --------------
# Note that identifiers starting with SIG are reserved by ANSI C.
# C89 requires signal handlers to return void; only K&R returned int;
# modern code does not need to worry about using this macro (not to
# mention that sigaction is better than signal).
AU_DEFUN([AC_TYPE_SIGNAL],
[AC_CACHE_CHECK([return type of signal handlers], ac_cv_type_signal,
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([#include <sys/types.h>
#include <signal.h>
],
		 [return *(signal (0, 0)) (0) == 1;])],
		   [ac_cv_type_signal=int],
		   [ac_cv_type_signal=void])])
AC_DEFINE_UNQUOTED(RETSIGTYPE, $ac_cv_type_signal,
		   [Define as the return type of signal handlers
		    (`int' or `void').])
], [your code may safely assume C89 semantics that RETSIGTYPE is void.
Remove this warning and the `AC_CACHE_CHECK' when you adjust the code.])

## ------------------------ ##
## Checking size of types.  ##
## ------------------------ ##

# ---------------- #
# Generic checks.  #
# ---------------- #

# AC_CHECK_SIZEOF(TYPE, [IGNORED], [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------------
AC_DEFUN([AC_CHECK_SIZEOF],
[AS_LITERAL_IF(m4_translit([[$1]], [*], [p]), [],
	       [m4_fatal([$0: requires literal arguments])])]dnl
[# The cast to long int works around a bug in the HP C Compiler
# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
# This bug is HP SR number 8606223364.
_AC_CACHE_CHECK_INT([size of $1], [AS_TR_SH([ac_cv_sizeof_$1])],
  [(long int) (sizeof ($1))],
  [AC_INCLUDES_DEFAULT([$3])],
  [if test "$AS_TR_SH([ac_cv_type_$1])" = yes; then
     AC_MSG_FAILURE([cannot compute sizeof ($1)], 77)
   else
     AS_TR_SH([ac_cv_sizeof_$1])=0
   fi])

AC_DEFINE_UNQUOTED(AS_TR_CPP(sizeof_$1), $AS_TR_SH([ac_cv_sizeof_$1]),
		   [The size of `$1', as computed by sizeof.])
])# AC_CHECK_SIZEOF

# AC_CHECK_ALIGNOF(TYPE, [INCLUDES = DEFAULT-INCLUDES])
# -----------------------------------------------------
# TYPE can include braces and semicolon, which AS_TR_CPP and AS_TR_SH
# (correctly) recognize as potential shell metacharacters.  So we
# have to flatten problematic characters ourselves to guarantee that
# AC_DEFINE_UNQUOTED will see a literal.
AC_DEFUN([AC_CHECK_ALIGNOF],
[m4_if(m4_index(m4_translit([[$1]], [`\"], [$]), [$]), [-1], [],
       [m4_fatal([$0: requires literal arguments])])]dnl
[_$0([$1], [$2], m4_translit([[$1]], [{;}], [___]))])

m4_define([_AC_CHECK_ALIGNOF],
[# The cast to long int works around a bug in the HP C Compiler,
# see AC_CHECK_SIZEOF for more information.
_AC_CACHE_CHECK_INT([alignment of $1], [AS_TR_SH([ac_cv_alignof_$3])],
  [(long int) offsetof (ac__type_alignof_, y)],
  [AC_INCLUDES_DEFAULT([$2])
#ifndef offsetof
# define offsetof(type, member) ((char *) &((type *) 0)->member - (char *) 0)
#endif
typedef struct { char x; $1 y; } ac__type_alignof_;],
  [if test "$AS_TR_SH([ac_cv_type_$3])" = yes; then
     AC_MSG_FAILURE([cannot compute alignment of $1], 77)
   else
     AS_TR_SH([ac_cv_alignof_$3])=0
   fi])

AC_DEFINE_UNQUOTED(AS_TR_CPP(alignof_$3), $AS_TR_SH([ac_cv_alignof_$3]),
		   [The normal alignment of `$1', in bytes.])
])# AC_CHECK_ALIGNOF

# AU::AC_INT_16_BITS
# ------------------
# What a great name :)
AU_DEFUN([AC_INT_16_BITS],
[AC_CHECK_SIZEOF([int])
test $ac_cv_sizeof_int = 2 &&
  AC_DEFINE(INT_16_BITS, 1,
	    [Define to 1 if `sizeof (int)' = 2.  Obsolete, use `SIZEOF_INT'.])
], [your code should no longer depend upon `INT_16_BITS', but upon
`SIZEOF_INT == 2'.  Remove this warning and the `AC_DEFINE' when you
adjust the code.])

# AU::AC_LONG_64_BITS
# -------------------
AU_DEFUN([AC_LONG_64_BITS],
[AC_CHECK_SIZEOF([long int])
test $ac_cv_sizeof_long_int = 8 &&
  AC_DEFINE(LONG_64_BITS, 1,
	    [Define to 1 if `sizeof (long int)' = 8.  Obsolete, use
	     `SIZEOF_LONG_INT'.])
], [your code should no longer depend upon `LONG_64_BITS', but upon
`SIZEOF_LONG_INT == 8'.  Remove this warning and the `AC_DEFINE' when
you adjust the code.])

## -------------------------- ##
## Generic structure checks.  ##
## -------------------------- ##

# ---------------- #
# Generic checks.  #
# ---------------- #

# _AC_CHECK_MEMBER_BODY
# ---------------------
# Shell function body for AC_CHECK_MEMBER.
m4_define([_AC_CHECK_MEMBER_BODY],
[  AS_LINENO_PUSH([$[]1])
  AC_CACHE_CHECK([for $[]2.$[]3], [$[]4],
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5],
[static $[]2 ac_aggr;
if (ac_aggr.$[]3)
return 0;])],
		[AS_VAR_SET([$[]4], [yes])],
  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]5],
[static $[]2 ac_aggr;
if (sizeof ac_aggr.$[]3)
return 0;])],
		[AS_VAR_SET([$[]4], [yes])],
		[AS_VAR_SET([$[]4], [no])])])])
  AS_LINENO_POP
])dnl

# AC_CHECK_MEMBER(AGGREGATE.MEMBER,
#		  [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		  [INCLUDES = DEFAULT-INCLUDES])
# ---------------------------------------------------------
# AGGREGATE.MEMBER is for instance `struct passwd.pw_gecos', shell
# variables are not a valid argument.
AC_DEFUN([AC_CHECK_MEMBER],
[AC_REQUIRE_SHELL_FN([ac_fn_]_AC_LANG_ABBREV[_check_member],
  [AS_FUNCTION_DESCRIBE([ac_fn_]_AC_LANG_ABBREV[_check_member],
    [LINENO AGGR MEMBER VAR INCLUDES],
    [Tries to find if the field MEMBER exists in type AGGR, after including
     INCLUDES, setting cache variable VAR accordingly.])],
    [_$0_BODY])]dnl
[AS_LITERAL_IF([$1], [], [m4_fatal([$0: requires literal arguments])])]dnl
[m4_if(m4_index([$1], [.]), [-1],
  [m4_fatal([$0: Did not see any dot in `$1'])])]dnl
[AS_VAR_PUSHDEF([ac_Member], [ac_cv_member_$1])]dnl
[ac_fn_[]_AC_LANG_ABBREV[]_check_member "$LINENO" ]dnl
[m4_bpatsubst([$1], [^$[^.]*$\.$.*$], ["\1" "\2"]) "ac_Member" ]dnl
["AS_ESCAPE([AC_INCLUDES_DEFAULT([$4])], [""])"
AS_VAR_IF([ac_Member], [yes], [$2], [$3])
AS_VAR_POPDEF([ac_Member])dnl
])# AC_CHECK_MEMBER

# _AC_CHECK_MEMBERS(AGGREGATE.MEMBER)
# -----------------------------------
# Helper to AC_CHECK_MEMBERS, which generates two of the four
# arguments to AC_CHECK_MEMBER that are based on AGGREGATE and MEMBER.
m4_define([_AC_CHECK_MEMBERS],
[[$1], [AC_DEFINE_UNQUOTED(AS_TR_CPP([HAVE_$1]), [1],
  [Define to 1 if `]m4_bpatsubst([$1],
    [^$[^.]*$\.$.*$], [[\2' is a member of `\1]])['.])]])

# AC_CHECK_MEMBERS([AGGREGATE.MEMBER, ...],
#		   [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
#		   [INCLUDES = DEFAULT-INCLUDES])
# ----------------------------------------------------------
# The first argument is an m4 list.
AC_DEFUN([AC_CHECK_MEMBERS],
[m4_map_args_sep([AC_CHECK_MEMBER(_$0(], [)[
$2], [$3], [$4])], [], $1)])

# ------------------------------------------------------- #
# Members that ought to be tested with AC_CHECK_MEMBERS.  #
# ------------------------------------------------------- #

AN_IDENTIFIER([st_blksize], [AC_CHECK_MEMBERS([struct stat.st_blksize])])
AN_IDENTIFIER([st_rdev],    [AC_CHECK_MEMBERS([struct stat.st_rdev])])

# Alphabetic order, please.

# _AC_STRUCT_DIRENT(MEMBER)
# -------------------------
AC_DEFUN([_AC_STRUCT_DIRENT],
[
  AC_REQUIRE([AC_HEADER_DIRENT])
  AC_CHECK_MEMBERS([struct dirent.$1], [], [],
    [[
#include <sys/types.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif
    ]])
])

# AC_STRUCT_DIRENT_D_INO
# ----------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_INO], [_AC_STRUCT_DIRENT([d_ino])])

# AC_STRUCT_DIRENT_D_TYPE
# -----------------------
AC_DEFUN([AC_STRUCT_DIRENT_D_TYPE], [_AC_STRUCT_DIRENT([d_type])])

# AC_STRUCT_ST_BLKSIZE
# --------------------
AU_DEFUN([AC_STRUCT_ST_BLKSIZE],
[AC_CHECK_MEMBERS([struct stat.st_blksize],
		 [AC_DEFINE(HAVE_ST_BLKSIZE, 1,
			    [Define to 1 if your `struct stat' has
			     `st_blksize'.  Deprecated, use
			     `HAVE_STRUCT_STAT_ST_BLKSIZE' instead.])])
], [your code should no longer depend upon `HAVE_ST_BLKSIZE', but
`HAVE_STRUCT_STAT_ST_BLKSIZE'.  Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_BLKSIZE

# AC_STRUCT_ST_BLOCKS
# -------------------
# If `struct stat' contains an `st_blocks' member, define
# HAVE_STRUCT_STAT_ST_BLOCKS.  Otherwise, add `fileblocks.o' to the
# output variable LIBOBJS.  We still define HAVE_ST_BLOCKS for backward
# compatibility.  In the future, we will activate specializations for
# this macro, so don't obsolete it right now.
#
# AC_OBSOLETE([$0], [; replace it with
#   AC_CHECK_MEMBERS([struct stat.st_blocks],
#		      [AC_LIBOBJ([fileblocks])])
# Please note that it will define `HAVE_STRUCT_STAT_ST_BLOCKS',
# and not `HAVE_ST_BLOCKS'.])dnl
#
AN_IDENTIFIER([st_blocks],  [AC_STRUCT_ST_BLOCKS])
AC_DEFUN([AC_STRUCT_ST_BLOCKS],
[AC_CHECK_MEMBERS([struct stat.st_blocks],
		  [AC_DEFINE(HAVE_ST_BLOCKS, 1,
			     [Define to 1 if your `struct stat' has
			      `st_blocks'.  Deprecated, use
			      `HAVE_STRUCT_STAT_ST_BLOCKS' instead.])],
		  [AC_LIBOBJ([fileblocks])])
])# AC_STRUCT_ST_BLOCKS

# AC_STRUCT_ST_RDEV
# -----------------
AU_DEFUN([AC_STRUCT_ST_RDEV],
[AC_CHECK_MEMBERS([struct stat.st_rdev],
		 [AC_DEFINE(HAVE_ST_RDEV, 1,
			    [Define to 1 if your `struct stat' has `st_rdev'.
			     Deprecated, use `HAVE_STRUCT_STAT_ST_RDEV'
			     instead.])])
], [your code should no longer depend upon `HAVE_ST_RDEV', but
`HAVE_STRUCT_STAT_ST_RDEV'.  Remove this warning and
the `AC_DEFINE' when you adjust the code.])# AC_STRUCT_ST_RDEV

# AC_STRUCT_TM
# ------------
# FIXME: This macro is badly named, it should be AC_CHECK_TYPE_STRUCT_TM.
# Or something else, but what? AC_CHECK_TYPE_STRUCT_TM_IN_SYS_TIME?
AC_DEFUN([AC_STRUCT_TM],
[AC_CACHE_CHECK([whether struct tm is in sys/time.h or time.h],
  ac_cv_struct_tm,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
#include <time.h>
],
				    [struct tm tm;
				     int *p = &tm.tm_sec;
				     return !p;])],
		   [ac_cv_struct_tm=time.h],
		   [ac_cv_struct_tm=sys/time.h])])
if test $ac_cv_struct_tm = sys/time.h; then
  AC_DEFINE(TM_IN_SYS_TIME, 1,
	    [Define to 1 if your <sys/time.h> declares `struct tm'.])
fi
])# AC_STRUCT_TM

# AC_STRUCT_TIMEZONE
# ------------------
# Figure out how to get the current timezone.  If `struct tm' has a
# `tm_zone' member, define `HAVE_TM_ZONE'.  Otherwise, if the
# external array `tzname' is found, define `HAVE_TZNAME'.
AN_IDENTIFIER([tm_zone], [AC_STRUCT_TIMEZONE])
AC_DEFUN([AC_STRUCT_TIMEZONE],
[AC_REQUIRE([AC_STRUCT_TM])dnl
AC_CHECK_MEMBERS([struct tm.tm_zone],,,[#include <sys/types.h>
#include <$ac_cv_struct_tm>
])
if test "$ac_cv_member_struct_tm_tm_zone" = yes; then
  AC_DEFINE(HAVE_TM_ZONE, 1,
	    [Define to 1 if your `struct tm' has `tm_zone'. Deprecated, use
	     `HAVE_STRUCT_TM_TM_ZONE' instead.])
else
  AC_CHECK_DECLS([tzname], , , [#include <time.h>])
  AC_CACHE_CHECK(for tzname, ac_cv_var_tzname,
[AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[#include <time.h>
#if !HAVE_DECL_TZNAME
extern char *tzname[];
#endif
]],
[[return tzname[0][0];]])],
		[ac_cv_var_tzname=yes],
		[ac_cv_var_tzname=no])])
  if test $ac_cv_var_tzname = yes; then
    AC_DEFINE(HAVE_TZNAME, 1,
	      [Define to 1 if you don't have `tm_zone' but do have the external
	       array `tzname'.])
  fi
fi
])# AC_STRUCT_TIMEZONE

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